Short And Long-Term Debt - Unsecured Notes (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	9 Months Ended									0 Months Ended					9 Months Ended
	Feb. 02, 2012	Sep. 30, 2012	Sep. 30, 2011	Jan. 05, 2011	Apr. 10, 2007 Senior Notes [Member]	Sep. 30, 2012 Senior Notes [Member] 10.50% Interest Rate [Member]	Sep. 30, 2012 Senior Notes [Member] 11.50% Interest Rate [Member]		Sep. 30, 2012 Senior Notes [Member] 12.00% Interest Rate [Member]		Apr. 16, 2012 Senior Toggle Notes [Member]	Apr. 10, 2007 Senior Toggle Notes [Member]	Sep. 30, 2012 Senior Toggle Notes [Member] 11.00%/11.75% Interest Rate [Member]		Sep. 30, 2012 Senior Toggle Notes [Member] Cash Interest [Member]	Sep. 30, 2012 Senior Toggle Notes [Member] Cash Interest [Member]	Sep. 30, 2012 Senior Toggle Notes [Member] Issuance of Senior Notes (PIK Interest) [Member]	Apr. 10, 2007 Senior Subordinated Notes [Member]		Sep. 30, 2012 Senior Subordinated Notes [Member] 12.375% Interest Rate [Member]		Sep. 30, 2012 Senior Subordinated Notes [Member] 13.375% Interest Rate [Member]
Debt Instrument [Line Items]
Senior notes				$ 303	$ 1,700							$ 550						$ 875	[1]
Interest rate, stated percentage						10.50%	11.50%	[2]	12.00%	[3]			11.00%	[4]						12.375%	[1]	13.375%
Debt instrument, face amount						64	492	[1]	130	[2]			41	[4]						190	[4]	10
Payment of interest on senior notes, allocation percentage																50.00%	50.00%
Description of variable interest rate basis																PIK Interest on the Senior Toggle Notes accrues at the Cash Interest rate per annum
Basis spread on variable interest rate															0.75%
Repayments of senior debt	$ 289	$ 640	$ 705								$ 11

[1] Consists of $492 million of 11.50% Senior Notes due 2017, less a discount of $3 million.

[2] Consists of $130 million of 12.00% Senior Notes due 2017, less a discount of $1 million

[3] Available capacity is subject to maintaining sufficient relocation related assets to collateralize these securitization obligations.

[4] Consists of $190 million of 12.375% Senior Subordinated Notes due 2015, less a discount of $2 million